At SIHH 2012, Jaeger-LeCoultre presented three new watches in its Master Control line. One of these is the Master Ultra Thin Réserve de Marche, which, like the other watches in the Ultra Thin range, are distinctly minimalist in their design, with a 39-millimetre case housing an automatic Jaeger-LeCoultre in-house Calibre 938 at 4 Hertz (28,800 oscillations per hour, compared to the usual rate of 21,600 – 3 Hertz – for most automatic timepieces). The case has been increased in size by 2 millimetres, and this definitely improves its appearance.
The movement is just 4.9 millimetres thick, and the total thickness is 9.85 millimetres. The 2012 version retains the mechanics and the overall look, but the lugs are more slender, creating a sleeker overall profile. Legibility is ensured by the Dauphine hands, superbly finished with one side satinized and the other polished, and the applied rhodium-plated hour markers. The other components on the dial are small seconds in a subdial at 6 o'clock, a pointer-type date display at 2 o'clock, and the power reserve indicator. Power reserve is 43 hours.
The watch is available in two versions: in steel with a sunburst silver-toned dial, and in pink gold with an eggshell-white dial. A note of colour is added by the three small hands, in blued steel. The sapphire caseback reveals the beautifully-decorated movement. The strap is in black alligator with steel clasp, or chocolate alligator with gold pin buckle.
The simplicity of this watch makes it great as a dress watch. Its reference numbers are 1378420 (stainless steel) and 1372520 (pink gold).
Jaeger-LeCoultre Master Ultra Thin Moon 39